Genome-Wide Association Study on Lodging Resistance-Related Traits in Oats

Area of Science:

• Plant breeding and genetics
• Agronomy
• Genomics

Background:

• Lodging resistance is crucial for oat (Avena sativa L.) yield and quality.
• Breeding lodging-resistant oat varieties enhances crop productivity and economic returns.

Purpose of the Study:

• To identify quantitative trait nucleotides (QTNs) associated with oat lodging resistance traits.
• To provide a basis for molecular marker development and breeding of lodging-resistant oat varieties.

Main Methods:

• Investigated seven lodging resistance-related traits in 130 oat germplasm across two sites.
• Conducted genome-wide association study (GWAS) using 36,928,068 high-quality Single-nucleotide polymorphisms (SNPs).
• Utilized the Bayesian-information and Linkage-disequilibrium Iteratively Nested Keyway (BLINK) model.

Main Results:

• Identified 379 QTNs associated with seven lodging resistance traits.
• 38, 34, 78, 66, 55, 18, and 94 QTNs were linked to plant height (PH), FWSS, SBS, stalk puncture strength (SPS), length of basal second internode (LBSI), diameter of basal second internode (DBSI), and wall thickness of basal second internode (WTBSI), respectively.
• Discovered stable QTNs for FWSS and SBS across environments, along with 54 candidate genes.

Conclusions:

• The identified QTNs and candidate genes provide insights into the genetic mechanisms of oat lodging resistance.
• This study offers valuable markers for molecular breeding and developing improved lodging-resistant oat varieties.